INVESTIGATION OF THE RELATIONSHIP BETWEEN ALBEDO, LAND SURFACE TEMPERATURE AND NDVI USING LANDSAT-7 AND LANDSAT-8 SATELLITE DATA: A CASE STUDY SAFRANBOLU

Year 2023, Volume: 26 Issue: 1, 177 - 190, 15.03.2023

Emre Yücer

https://doi.org/10.17780/ksujes.1192591

Abstract

Developing remote sensing technologies are effectively used in monitoring the changes in surface parameters in urban areas. Information about urban heat islands is obtained by utilizing the spectral and thermal properties of surfaces at local and global scale. In our study, Safranbolu district of Karabük province, which is on the World Cultural Heritage list, has been chosen as the application area. Landsat-7 satellite image data from 12/08/1999, and Landsat-8 satellite image data from 11/08/2019, were used to calculate the Albedo, Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) variables. In the results, it was determined that there were positive relations between LST and albedo, negative relations between LST and NDVI, and negative relations between albedo and NDVI. These relationships were found similarly in both correlation analysis and scatter plots. The main factors affecting the relationship between LST, albedo and NDVI can be listed as the type of material on the surface, the amount of moisture on the surface, vegetation and its density.

Keywords

Albedo, Landsat, normalised difference vegetation index, Safranbolu, land surface temperature

ALBEDO, YER YÜZEY SICAKLIĞI VE NDVI ARASINDAKİ İLİŞKİNİN LANDSAT-7 VE LANDSAT-8 UYDU VERİLERİ KULLANILARAK İNCELENMESİ: SAFRANBOLU ÖRNEĞİ

Abstract

Gelişen uzaktan algılama teknolojileri, kentsel alanlarda meydana gelen yüzey parametrelerindeki değişimlerin izlenmesinde etkin şekilde kullanılmaktadır. Yerel ve küresel ölçekte yüzeylerin spektral ve termal özelliklerinden yararlanarak kentsel ısı adaları hakkında bilgiler elde edilmektedir. Çalışmamızda Dünya Kültür Mirası listesinde bulunan Karabük ilinin Safranbolu ilçesi çalışma alanı olarak seçilmiştir. Albedo, Normalize Edilmiş Fark Bitki Örtüsü İndeksi (NDVI) ve Yer Yüzey Sıcaklığı (YYS) değişkenlerinin hesaplanması için 12/08/1999 tarihli Landsat-7 ve 11/08/2019 tarihli Landsat-8 uydu verileri kullanılmıştır. Değişkenler arasındaki ilişkiyi ortaya çıkarmak için korelasyon ve saçılım analizleri uygulanmıştır. Elde edilen sonuçlarda; YYS ve albedo arasında pozitif, YYS ve NDVI arasında negatif, albedo ve NDVI arasında negatif yönlü ilişkinin olduğu tespit edilmiştir. Bu ilişkiler hem korelasyon analizinde hem de saçılım grafiklerinde benzer şekilde çıkmıştır. YYS, albedo ve NDVI arasındaki ilişkiyi etkileyen başlıca etmenler; yüzeydeki malzemenin türü, yüzeydeki nem miktarı, bitki örtüsü ve yoğunluğu şeklinde sıralanabilir.

Keywords

Albedo, Landsat, normalize edilmiş fark bitki örtüsü indeksi, Safranbolu, yer yüzey sıcaklığı

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